Pyongyang (literally: "Flat Land" or "Peaceful Land") is the capital of the Democratic People's Republic of Korea, commonly known as North Korea, and the largest city in the country. Pyongyang is located on the Taedong River and, according to preliminary results from the 2008 population census, has a population of 3,255,388.
The triangular structure is the 330 meter (1,080 ft) Ryugyeong Hotel:
http://en.wikipedia.org/wiki/Ryugyeong_Hotel